Modified Method for Automatic Exposure Control in Pediatric Brain CT-Application of the Standard Deviation Value Method by Use of Patient's Age and Head Size-

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  • Furuya Ken
    Municipal Kofu Hospital Central Radiologic Room Interdisciplinary Graduate School of Medicine and Engineerig, University of Yamanashi
  • Nambu Atushi
    Interdisciplinary Graduate School of Medicine and Engineerig, University of Yamanashi
  • Nakamura Kouji
    Municipal Kofu Hospital Central Radiologic Room
  • Watanabe Rie
    Municipal Kofu Hospital Central Radiologic Room
  • Nogata Youko
    Municipal Kofu Hospital Department of Radiology
  • Komiyama Takashi
    Municipal Kofu Hospital Department of Radiology
  • Araki Tsutomu
    Interdisciplinary Graduate School of Medicine and Engineerig, University of Yamanashi

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Other Title
  • 小児頭部ＣＴ検査における自動露出制御の一手法－年齢および頭部サイズを考慮した標準偏差（ＳＤ）値の設定法－
  • ショウニ トウブ CT ケンサ ニ オケル ジドウ ロシュツ セイギョ ノ イチシュホウ ネンレイ オヨビ トウブ サイズ オ コウリョ シタ ヒョウジュン ヘンサ SD チ ノ セッテイホウ

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We examined the optimum conditions for pediatric brain CT scans. CT controls the X-ray transit dose using tube current alteration called automatic exposure control (AEC) to adjust the standard deviation (SD) value for each scanning region, and it also reduces exposure. If the SD value is inappropriate, children may be exposed to increased radiation. Therefore we acquired images of 500 children from the server, and examined the most suitable SD value for each age using the data of their SD value and age. X-ray transit control with AEC was influenced by scan position and the age of a child. We enabled accurate scanning and decreased radiation exposure by adjusting AEC to the age and the cephalic volume of each child. As a result, reduction of the X-ray exposure by up to 31.2% per slice in tube current alteration was possible using a suitable SD value for each age. On the other hand, it was possible to reduce X-ray exposure by up to 67.9% per slice with the scan technique that used age and corrected cephalic volume without adjusting AEC. Using the tube current alteration protocol for each age with the data of the SD value or cephalic volume in CT, we can more easily conduct scans of children under optimal conditions.

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